满堂脚手架
参考答案：
按施工作业和平面满布设置的多排脚手架。
In our city, citizens _____ the library, which makes it easy for them to read any book they like. [ ]
A. have free access to
B. have free access in
C. have freely access to
D. have freely access in
丈量了l1和l2两段距离，且l1>l2，但它们的中误差相等，故l1和l2两段距离的观测精度是相同的。
